Noun

• S: (n) whistle, whistling (the sound made by something moving rapidly or by steam coming out of a small aperture)
• S: (n) whistle, whistling (the act of signalling (e.g., summoning) by whistling or blowing a whistle) "the whistle signalled the end of the game"
• S: (n) whistle (a small wind instrument that produces a whistling sound by blowing into it)
• S: (n) whistle (acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound)
• S: (n) pennywhistle, tin whistle, whistle (an inexpensive fipple flute)

Verb

• S: (v) whistle (make whistling sounds) "He lay there, snoring and whistling"
• S: (v) whistle (move with, or as with, a whistling sound) "The bullets whistled past him"
• S: (v) whistle (utter or express by whistling) "She whistled a melody"
• S: (v) whistle (move, send, or bring as if by whistling) "Her optimism whistled away these worries"
• S: (v) whistle, sing (make a whining, ringing, or whistling sound) "the kettle was singing"; "the bullet sang past his ear"
• S: (v) whistle (give a signal by whistling) "She whistled for her maid"